Surface activated growth area for optimal adhesion and best proliferation of adherent cells Suitable for suspension cells Geometry of the neck reduces risk of media slop over Stabilizing rim offers secure, slip free piling of several flasks Highly visible bilateral marking area White volume graduations on both sides for optic control of the filling volume Crystal clear transparency Flasks are available with «VENT» or filter screw caps Filter screw caps offer constant sterile gas exchange through the hydrophobic non-wetting PTFE membrane with pore size 0.22 μm